In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Where Venice's gondolas go for a tune-up.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A former customs station on the border of Germany and the Netherlands.

This center tells the story of one of the most famous battles in Irish history.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

The ruins of a monastery that dates to the 7th century.

This Neolithic passage tomb forms part of a World Heritage Site.

A hugely vast Irish landscape of barren rock that stretches for miles.

The oldest licensed distillery in Ireland.

This natural sea arch highlights Ireland's rugged coastal beauty.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

A stunning Victorian abbey and walled garden on a lakefront.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

An ancient neolithic tomb that only sees the sun twice a year.

Only a few walls remain of the last church the Pilgrims used before they sailed to North America.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

An ancient Egyptian temple sits within a modern European museum.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.